Mavic Ksyrium Merino Arm Warmer X-Large BlackThe Mavic Ksyrium Merino Arm Warmer is a Seamless Odor Resistant Breathable riding accessory. The Merino fibers are incredibly soft, and so fine that won’t cause itching while riding. Another benefit of the fibers is that they contain many air pockets in order to keep you warm without overheating. The Active Merino wool continually regulates its temperature and dries quickly to ensure that you’re warm, even when you’re wet.889645102290